Class: DataFrame

Inherits:
ERObj show all
Defined in:
lib/rsruby/dataframe.rb

Overview

Synopsis

This is an extended ERObj class inspired by the example given in the RPy manual used for R data frames. As with ERObj, methods caught by method_missing are converted into attribute calls on the R dataframe it represents. The rows and columns methods give access to the column and row names.

Usage

See examples/dataframe.rb for examples of usage.

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Author

Alex Gutteridge

Copyright © 2006 Alex Gutteridge

The Original Code is the RPy python module.

The Initial Developer of the Original Code is Walter Moreira. Portions created by the Initial Developer are Copyright © 2002 the Initial Developer. All Rights Reserved.

Contributor(s):

Gregory R. Warnes <[email protected]> (RPy Maintainer)

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA ++

Instance Method Summary collapse

Methods inherited from ERObj

#as_r, #initialize, #lcall, #to_ruby, #to_s

Constructor Details

This class inherits a constructor from ERObj

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(attr) ⇒ Object 



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# File 'lib/rsruby/dataframe.rb', line 66

def method_missing(attr)
  attr = attr.to_s
  mode = RSRuby.get_default_mode
  RSRuby.set_default_mode(RSRuby::BASIC_CONVERSION)
  column_names = @r.colnames(@robj)
  if attr == column_names or column_names.include?(attr)
    RSRuby.set_default_mode(mode)
    return @r['$'].call(@robj,attr.to_s)
  end

  #? Not sure what here...
  RSRuby.set_default_mode(mode)
  return super(attr)

end

Instance Method Details

#[](col) ⇒ Object 



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# File 'lib/rsruby/dataframe.rb', line 62

def[](col)
  return @r['$'].call(@robj,col.to_s)
end

#columns ⇒ Object

Returns an array of the column names used in the R data frame.



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# File 'lib/rsruby/dataframe.rb', line 56

def columns
  cols = @r.colnames(@robj)
  cols = [cols] unless cols.class == 'Array'
  return cols
end

#rows ⇒ Object

Returns an array of the row names used in the R data frame.



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# File 'lib/rsruby/dataframe.rb', line 51

def rows
  return @r.attr(@robj, 'row.names')
end